It appears the intent was to purchase control over the ownership of the companies at prevailing market rates. As far as I can tell, the existing stock owners were entirely free to refuse the state's purchase offer and maintain control indefinitely, if they so chose. That doesn't sound like a tax at all.

I'm sorry, I see now that I mismwrote on the original version of löntagarfonder, I wrote buy, the correct word should be take.

Original idea was to take the dividend as new stock. Nothing voluntary, no buying at market rates.